Open-hearth furnace.



T. s. BLAIR, m, OPEN HEARTH FURNACE. APPLICATION ,FILED JULY 20.1917.

Patented Nov. 6, 1917,

4 SHEETS-SHEET I.

J72 ve722%?? T. S. BLAIR, JR.

\OPEN HEARTH FURNACE.

APPLICATION FILED JULY 20.1917.

Patented Nov. 6, 1917.

4 SHEETSSHEET Z.

T. S. BLAPR, IR.

OPEN HEARTH FURNACE.

APPLICATION FILED JULY 20. $911.

1,245,555. Patented Nov. 6, 1917.

. 4 SHEETS-SHEET 3.

jzmfizr' I T. S. BLAIR, JR-

OPEN HEARTH FURNACE.

' APPLICATION FILED JULY 20.1917.

Patented Nov. 6, 1917 4 SHEETSSHEET 4.

El) STATS PATENT @FFTQE.

THOMAS S. BLAIR, JR., OF CH ICAGO, ILLIITOIS, ASSIGNOR TO BLAIR ENGINEERING COMPANY, OF NEW YORK. N. Y., A CORPORATION OF NEW YORK.

. OPEN-HEARTH FURNACE.

Specification of Letters Patent.

Patented Nov. c, 191?.

To all whom it may concern:

Be it known that I, THOMAS S. BLAIR, Jr., a citizenof the United States, residing at 343 South Dearborn street, Chicago, in the county of Cook and State of Illinois, have invented a new and useful Improvement in Open-Hearth Furnaces, ofv which the following is a specification.

My invention relates to certain new and useful improvements in open hearth furnaces and is fully described and explained in the specification and shown in the accompanying drawings, in which:

Figure 1 is a central longitudinal section on the line 1 of Fig. 3 through the end of an open hearth furnace; Fig. 2 is a section on the line 2 of Fig. 1 through the furnace setting showing the gas port covering and its associated parts in plan, a portion thereof being broken away to show the structure underneath; Fig. 3 is an end view of the furnace; Fig. 4- is a perspective View of the gas port covering, its connections and the bulkhead construction; and Fig. 5 is a horizontal section on the line 5 5 of Fig. 1.

Referring to the drawings, 6 is the gas port covering made in accordance with my application filed September 12, 1916, Serial No. 119,689. The remainder of the furnace is of a typical form, such as that described in the aforesaid. application and requires no detailed description. 7 is a gas down take and at the upper end of the down take, and immediately below the entrance of the as port thereto, is a water cooled bulk-hea 8 of the form also shown, described and claimed in my aforesaid application.

In the operation of the furnace in said application it has been found that not only does the slag coming back through the gas port accumulate upon the bulk-head as therein set forth, so as to protect the surface thereof and also prevent undue chilling, but at the extreme upper .end of the bulk-head slag often accumulates in a lump of considerable size so that after a period of use the lump is big enough to somewhat throttle the down-take and it is then necessary to break off the lump. In common practice with the device of the aforesaid application it has been customary to line the bulk-head with an initial thin layer of clay brick, and sometimes in breaking off this lum the whole lining has come off with it and alien into the slag pocket. While eter inclines slightly upward and inward from the bulk-head surface. The pipes extend through the furnace from the frontto back walls, or in the case of a dog-house type of furnace like that illustrated from the front to back Walls of the gas downtake.

The space between the pipes 9 is filled with bodies of chrome ore 10. Water is circulated through the pipes 9 in order to make them relatively permanent, and prevent their destruction by heat.

It is found in practice that a furnace of this structure runs indefinitely without any slag accumulation and with no appreciable depreciation of the chrome ore body. I do not pretend to explain the reason for this action. It is possible that the slag really does accumulate until of sufficient thickness to break away a small volume of the chrome'ore so that successive'fresh surfaces are exposed from time to time. However this may be it is a fact that at no time is there either a noticeable accumulation of slag or an appreciable disappearance ofthe chrome ore.

For the purpose of passing water through the ore supporting pipes 9, each is provided with an intake .pipe 11 and an outlet 12.- Water enters the intake pipe 11 from a header 13 to which it may be supplied by any appropriate means as by a stream running into a funnel-shaped opening in the top of the header. The outlet pipes 12 are all carried up and discharge into the port cov-- ering.

I realize that onsiderable variation is possible in the details of thisconstruction without departing from the spirit of my invention; therefore, I do not intend to limit myself to the specific form herein shown and described except as pointed out in the following claims,-in which it is my intention ,to claim all the novelty inherent in the con- 1. In an open hearth furnace walls forming a gas port and a down-take communicating therewith, a chrome ore facing in the upper part of'the end wall of the gas downtake immediately below the entrance of the gas port thereto, and means for maintaining said facing in position.

2. In an open hearth furnace walls form-- ing a gas port and a down-take communicating therewith, a chrome ore facing in the upper part of the end wall of the gas down-take immediately below the entrance of the gas port thereto, and means for maintainingsaid facing in position said means consistin of a series of water co0led 'shelves upon whlch sections-of the facing rest.

3. In an open hearth furnace walls forming a gas port and a down-take communicating therewith, a water cooled bulk-head in the upper part of the end wall of the down-take immediately below the entrance of the gas ort thereto, a chrome ore facing on the bul -head, and means for maintaining the facing in position said means consisting of a series of water cooled shelves upon which sections of the facing rest.

4. In an open hearth furnace walls forming a gas port and a down-take communicating therewith, a chrome ore facing in the upper part of the end wall of the gas down-take immediately below the entrance of the gas port thereto and inclining upward and outward, and means for maintaining said facing in position.

5. In an open hearth furnace walls forming a gas port and a down-take communicating therewith, a chrome ore facing in the upper part of the end wall of the gas downtake immediately below the entranceof the gas port thereto and inclining upward and outward, and means for maintaining said facing in position, said means consisting of a series of water cooled shelves upon which sections of the facing rest.

6. In an open hearth furnace walls forming a gas port and a down-take communicating therewith, a water 'cooled' bulk-head in the upper part of the end wall of the down-take immediately below the entrance 'of the gas port thereto and inclining upward and outward, a chrome ore facing onthe bulk-head, and means for maintaining the facing in position.

7. In an open h h furnace walls forming a gas port and a down-take communicating therewith, a water cooled bulk-head in the upper part of the endwall of the down-take immediately "below the entrance of the gas port thereto and inclining upward and outward a chrome ore facing on the bulk-head, and means for maintaining the facing in osition said means consisting of a series 0 water cooled shelves upon which sections of the facing rest.

THOMAS semis, JR. 

